package com.gzsxy.syn;

//不安全的取钱
//两个人去银行取钱，账户
public class UnsafeBank {
    public static void main(String[] args) {
        Account account = new Account(100, "结婚基金");
        Drawing you = new Drawing(account, 50, "你");
        Drawing girlFriend = new Drawing(account, 100, "girlFriend");


        you.start();
        girlFriend.start();

    }
}


//账户
class Account {
    int money; //金额
    String name;//卡号


    public Account(int money, String name) {
        this.money = money;
        this.name = name;
    }
}


//银行：模拟取款
class Drawing extends Thread {
    Account account; //账户

    //取了多少前
    int drawingMoney;
    //现在手里有多少钱
    int nowMoney;

    public Drawing(Account account, int drawingMoney, String name) {
        super(name);
        this.account = account;
        this.drawingMoney = drawingMoney;

    }


    //取钱
    //synchronized 默认锁的是this
    @Override
    //这个run方法相当于银行，所以在run 方法上加synchronized没用，应该锁账户
    public void run() {

        //锁的对象就是变化的量，需要增删改的对象 （账户）
        synchronized (account) {
            //判断有没有钱
            if (account.money - drawingMoney < 0) {
                System.out.println(Thread.currentThread().getName() + "钱不够，取不了");
                return;
            }
            //当加一个睡眠1s后，程序认为account.money当前还是为100元所以跳过了if判断，进入下面，
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            //卡内余额 = 余额- 你取的钱
            account.money = account.money - drawingMoney;
            //你手里的钱
            nowMoney = nowMoney + drawingMoney;

            System.out.println(account.name + "余额为" + account.money);
            //Thread.currentThread().getName()=this.getName()
            System.out.println(this.getName() + "手里的钱：" + nowMoney);

        }


    }

}
